Tellurite And Fluorotellurite Glasses For Active And Passive

7. Surface properties; MDO 276
This peak was asymmetric, with a higher bonding energy shoulder at 532.4 eV (17.5 %),
to the main peak at 530.9 eV (82.5 %). Table (7.4) summarises the quantitative analysis
for this glass from the high resolution scans.
Table (7.4): Quantitative analysis from high resolution XPS scans of cleaved glass
MOD015 (82.5TeO2-7.5WO3-10Nb2O5 mol. %), and theoretical peak positions and
atomic % batched.
XPS peak
Theoretical
Peak / eV At. %
High resolution XPS scan
Peak / eV At. % Wt. %
O 1s 530.4 68.35 530.9 66.67 20.49
Te 3d5/2 576.2 23.74 576.8 25.15 61.66
W 4d5/2 248.0 2.16 247.6 1.86 6.56
Nd 3d5/2 207.6 5.76 207.5 6.33 11.29
It can be seen that the at. % quantitative analysis were very close to the as-batched values
(varying 2.5 to 13.9 %). For comparison, fig. (7.9) shows the wide scan of the polished
surface of glass MOD015. The intense peak at around 285 eV was due to C1s, i.e.
organic contamination at the surface. Fig. (7.10) shows the high resolution O1s scan from
the polished surface (see section 6.1.1.1) of glass MOD015,